110results about How to "Good opening performance" patented technology

The invention relates to a tear-resistant polyethylene film, a composite membrane and a preparation method thereof. The polyethylene film comprises a corona layer, a middle layer and a heat sealing layer, wherein the corona layer and the middle layer are each composed of first metallocene PE, octa-carbon LLDPE and processing aids, and the heat sealing layer is composed of the first metallocene PE, second metallocene PE, silicone, a slipping agent and an opening agent. The composite membrane is formed by a PET printing membrane layer, a first extruded PE membrane layer, an aluminum foil layer, a second extruded PE membrane layer and a polyethylene membrane layer which are sequentially fitted in the membrane layer thickness direction; the extruded PE membrane layer comprises a first adhesive layer in fit with the aluminum foil layer and a second adhesive layer in fit with the PET printing membrane layer or the polyethylene membrane layer, wherein the first adhesive layer is composed of third metallocene PE and adhesive resin, and the second adhesive layer is composed of the third metallocene PE and color master batch. The polyethylene film and the composite membrane disclosed by the invention have higher tear resistance strength. In addition, the composite membrane has excellent humidity resistance property.

A gas-insulated circuit breaker has a sealed container filled with gas; a pair of contacts so constructed as to be connected and separated each other in the sealed container; gas flow generation means for blasting the gas on an arc generated when the contacts are separated, the gas flow generation means including: an accumulation space, pressure increasing means for increasing the pressure of the pressure accumulation space, a gas passage connecting the pressure accumulation space to the arc, and an insulating nozzle that controls the flow of the gas from the pressure accumulation space to the arc; an inside-nozzle insulating member disposed co-axially with the insulating nozzle. The arc is generated in a space between an inner wall section of the insulating nozzle and an outer wall section of the inside-nozzle insulating member, and the gas flows in the space.

A gas-insulated circuit breaker has a sealed container filled with gas; a pair of contacts so constructed as to be connected and separated each other in the sealed container; gas flow generation means for blasting the gas on an arc generated when the contacts are separated, the gas flow generation means including: an accumulation space, pressure increasing means for increasing the pressure of the pressure accumulation space, a gas passage connecting the pressure accumulation space to the arc, and an insulating nozzle that controls the flow of the gas from the pressure accumulation space to the arc; an inside-nozzle insulating member disposed co-axially with the insulating nozzle. The arc is generated in a space between an inner wall section of the insulating nozzle and an outer wall section of the inside-nozzle insulating member, and the gas flows in the space.

The invention discloses a foil end face gas film sealing structure with enhanced radial flow-induced opening. The structure comprises a moving ring and a static ring which are sealed by a gas film, atleast one sealing ring of the moving ring or the static ring is a floating ring supported by a spring, and the sealing end of the floating ring is a foil end face; the foil end face comprises a ring-shaped ring body, a foil, a foil fixing seat and a fastening screw; a plurality of positioning grooves are uniformly formed in the circumferential direction of the ring body; part of the foil is bentto form a bent foil, the other part of the foil is flat and straight to form a straight foil, the bent foil is cut into small pieces in the radial direction, and the cross section of the straight foilin any radial direction is a wing-shaped cross section; the foil fixing seat is inserted into a positioning groove through clearance fit to be fixed through the fastening screw; the end, away from the foil, of the straight foil is welded to the foil fixing seat; the circumferential direction of the part from the flat and straight end to the bent end of the foil is conformed to the circumferentialdirection of air flow.

A gas lubrication bird-wing-shape-imitation v groove end face sealing structure comprises two sealing rings with sealed end faces; the two sealing rings comprise a movable ring and a static ring; the end face of at least one of the movable ring and the static ring is provided with a plurality of bird-wing-shape-imitation v grooves; each bird-wing-shape-imitation v groove is composed of a tail-feather-shape-imitation v groove body and a flight-feather-shape-imitation v groove body; the tail-feather-shape-imitation v groove bodies are provided with swallow-tail-shaped furcal tails; the flight-feather-shape-imitation v groove bodies are roughly in a bull horn shape with the thick ends and the tail tip ends; the tail-feather-shape-imitation v groove bodies are transversely arranged at the thick ends of the flight-feather-shape-imitation v groove bodies; the thick segments of the flight-feather-shape-imitation v groove bodies and the thick ends of the tail-feather-shape-imitation v groove bodies are toward airflow; the bird-wing-shape-imitation v grooves are arranged to be bird-wing-shape-imitation v groove annular belts; secondary annular sealing dams are arranged between the bird-wing-shape-imitation v groove annular belts; annular main sealing dams are arranged on the low-pressure sides of the end faces; drainage grooves are arranged on the high-pressure sides of the end faces; the drainage grooves and the bird-wing-shape-imitation v grooves are shallow grooves of the micrometer scale; the depths of the flight-feather-shape-imitation v groove bodies are gradually decreased in the airflow direction. The sealing structure has the advantages of being good in stability and long in service life, and resisting abrasion.

The invention discloses a two-way rotating gas dynamic / static pressure mechanical seal type bird wing-shaped groove structure. The structure comprises two mechanically sealed sealing rings-a dynamic ring and a static ring. The structure is characterized in that a plurality of bird wing-shaped grooves are formed in the end surface of at least one sealing ring of the dynamic ring and the static ring; the bird wing-shaped grooves are shallow grooves in micrometer scale, and consist of tail feather-shaped grooves and flight feather-shaped grooves; the tail feather-shaped grooves have swallow tail-shaped furcal tails; the flight feather-shaped grooves substantially take the shape of ox horns with thick ends and tail tip ends; the tail feather-shaped grooves are transversely arranged at the thick ends of the flight feather-shaped grooves; every two bird wing-shaped grooves form groove pairs in a splayed shape; multiple groove pairs are evenly arranged peripherally to form a bird wing-shaped groove ring belt; the bird wing-shaped groove ring belt is arranged at the high-pressure side of the end surface; and the depths of the flight feather-shaped grooves are gradually decreased in the airflow direction. The structure has the characteristics of two-way rotation, excellent opening character, good stability, wear resistance and long service life.

The invention discloses multi-stage modified thermoplastic starch master batch. According to the invention, starch is subjected to four-stage graded modification treatment. The graded modification treatment comprises the following steps: weighing 100 parts of starch with a water content of 15-30%, and stirring the starch in a high-speed mixer for the first time at a room temperature at a high speed; carrying out heating to 50-70 DEG C, adding polybutadiene, a plasticizer and a chemical modifier, and carrying out high-speed stirring for the second time; carrying out heating to 75-95 DEG C, adding a tackifier, a lubricant, a filler and a chain extender, and carrying out stirring at a high speed for the third time; adding biodegradable resin at the temperature, and carrying out stirring at a high speed for the fourth time; and stopping stirring, keeping the temperature for a period of time, and then adding a formed mixture into a double-screw extruder for melt extrusion. The invention also discloses a preparation method and application of the multi-stage modified thermoplastic starch master batch. The thermoplastic starch master batch disclosed by the invention can effectively improve the compatibility of starch and other biodegradable materials; and meanwhile, the content of starch in a biodegradable film is improved, and relatively good mechanical properties, film surface smoothness and certain transparency are kept.

The invention relates to the field of high polymer materials, in particular to a blow molding processing method of a CPP film. The blow molding processing method of the CPP film comprises the following steps that 1, a thin-wall tube is extruded, specifically, PP raw materials are added to a barrel of an extruder, the materials are rotated, extruded, stirred and pushed by a screw, and finally the materials are extruded into the thin-wall tube by a right-angle machine head, wherein the screw compression ratio is 2.8-4.0, extrusion temperature of the right angle machine head is 200-215 DEG C; 2,the thin-walled tube is blown into a thin-film tube, specifically, compressed air blows the thin-walled tube into the thin-film tube; 3, the thin-film tube is cooled and shaped, specifically, the thin-film tube is cooled by air cooling first and then water cooling; (4) the film-tube clamp is flattened, specifically, the thin-film tube is flattened through two rotating belt wires in an inverted V shape; and 5, the thin-film tube is pulled and winded, specifically, the flattened thin-film tube is compressed by a pulling roller and then enters a winding device by a guiding roller. The blow molding processing method of the CPP film is used for solving the problems in the prior art that the thin-film tube is unstable in traction and prone to being broken in the process of CPP film blow moldingprocessing.

The invention discloses a dedicated material for a full-biodegradation mulching film special for peanuts. The dedicated material is characterized by being prepared from the following ingredients in parts by weight: 100 parts of PLA, 70 to 90 parts of PBAT, 0.5 to 1.0 part of nucleating agent, 5 to 10 parts of compound anti-hydrolysis agent, 0.5 to 1.5 parts of compound anti-ultraviolet agent, 3 to6 parts of molecular weight modifier and 20 to 30 parts of flexibility modifier. The mulching film prepared from the dedicated material disclosed by the invention has the advantages of excellent anti-hydrolysis performance, excellent light aging resistance, good flexibility performance, good mulching film anti-blocking property (saving mulching film laying time) and high light transmittance. Under the composting condition, the dedicated material can be completely and biologically degraded into carbon dioxide and water; thus, pollution to soil and environment is avoided, and the dedicated material is suitable for being utilized as peanut mulching films.

The invention discloses a polyolefine full transparent master batch and a preparation method thereof; wherein, the weight percentage of the components of the polyolefine full transparent master batchis as follows: 70 to 80 percent of glauber salt, 4 to 15 percent of linear low density polyethylene, 4 to 10 percent of ethylene vinyl acetate copolymer, 2 to 3 percent of polyethylene wax, 1 to 2 percent of soap salt, 0.5 to 1 percent of fatty acid and 1 to 2 percent of a coupling agent. The preparation method of the master batch of the invention includes the following steps: after being added into a highly mixing machine, stirred with high speed and heated to 110 DEG C, the glauber salt is added with the coupling agent for three times for coating; then the polyethylene wax, soap salt and thefatty acid are sequentially added; then the linear low density polyethylene and the ethylene vinyl acetate copolymer are added, mixed uniformly and discharged; the components are transferred into a crusher to be cooled and crushed; finally, the premixed materials are extruded into granular master batches in a co-rotating twin screw extruder with the length-diameter ratio of 36 to 48. The polyolefine full transparent master batch has lower density, good dispersion, opening property and color, excellent optical property and very high economy and is widely used in blow-molded, extrusion and injection-molded products.

The invention discloses a high-and-low-temperature anti-fog gas-permeable polyolefin heat-sealing film for fruit and vegetable packaging. The high-and-low-temperature anti-fog gas-permeable polyolefinheat-sealing film comprises a corona layer, a core layer and a heat-sealing layer from top to bottom, wherein a layer ratio structure of three-layer co-extrusion is as follows: the layer ratio structure corona layer / core layer / heat-sealing layer of three-layer co-extrusion is HOPP / (HOPP and high-and-low temperature antifogging agent) / (mPE and LLDPE and PBS and high-and-low temperature antifoggingagent and superfine diatomite). According to the invention, a certain proportion of a high-and-low-temperature compound antifogging agent is added into a heat-sealing layer and a core layer, so thatthe film has high temperature and low temperature antifogging performance at the same time; superfine diatomite is added into the heat-sealing layer, so that the precipitation of the antifogging agentis delayed and the antifogging time of the film is prolonged by using the adsorption function of the superfine diatomite, and the granularity of diatomite can increase the gas permeability and the opening property of the film and increase the strength of the film so as to solve the problem of film strength reducing caused by addition of the antifogging agent and prepare the polyolefin heat-seal film being transparent, high in heat-seal strength and good in antifogging effect.

A micro-hole end face mechanical seal structure with air inlet grooves comprises two end faces for mechanical sealing, namely a moving ring and a stationary ring, wherein one end face is sequentially provided with micro-hole groups and annular sealing dams which are symmetrically distributed relative to the rotation center from the high-pressure side to the low-pressure side. Multiple rows of micro-hole groups are distributed on the high-pressure side of the end face and comprise the linear air inlet grooves and multiple elliptic micro-holes, the centers of the micro-holes are located on the air inlet grooves, included angles formed by long shafts of the micro-holes and the air inlet grooves are identical, and one end of each micro-hole facing air flows is located on the high-pressure side of the end face. A straight line where the air inlet grooves are located is located on the radius of the end face. The low-pressure side of the end face is provided with the annular sealing dams with smooth faces. The micro-hole end face mechanical seal structure has the advantages that the opening performance under the high-pressure frequent start-stop condition is improved; the problem of poor hydrodynamic effect of the end faces caused by the air negative pressure effect is solved; the solid particle preventing capacity and the advantages of the micro-holes are fully played; the hydrodynamic effect and the disturbance-resisting performance are enhanced, the service life is prolonged, and the stability of the end faces is improved.